One click optimisation shuts down Firefox

Hi all,

 

Woke the computer up from sleep mode and found NU's One Click Optimisation (OCO) in progress.  I minimised it and opened Firefox, then Gmail.  Part way through writing a message, pressing Return, Firefox disappeared and was replaced by the OCO screen, the process still running.  The process was timed to run at 19:00 hours but it must have started closer to 20:45.  Could it have been "pending" till I woke up the PC?

 

I restarted FF/Gmail and nothing else untoward happened.  OCO ran to completion OK.

 

This is the second time this has happened.

 

I use Windows XP SP3 and I'm on the latest release of FF and running NU 16 v16.1.0.4.

 

Ian